First – get the oid(s) of the snr – it consists of
.1.3.6.1.4.1.41112.1.4.7.1.3.1

followed by the mac address of the radio interface. to get it:

snmpwalk -On -v 1 -c CommunityString IP.Add.r.ess .1.3.6.1.4.1.41112.1.4.7.1.3.1

you should get one or more values like:

.1.3.6.1.4.1.41112.1.4.7.1.3.1.36.90.76.236.135.45 = INTEGER: -59

Each entry is the mac address of the remote radio (and snr) connecting to this radio

now set up a graph for the above oid

In cacti Console – Create – New Graph

Set the Device to be the device to be monitored

Select under New Graph Template – “SNMP – Generic OID Template” – Select Create

On new page

Title: |host_description| – SNR

Vertical Label SNR

Auto Scale Options – Use –alt-autoscale-min (accepting an upper limit)

Upper limit 0

Lower limit -200

Set the color (I like 0000ff)

Legend Text (leave blank)

Datasource

Name |host_description| – SNR

Minimum Value -200

Maximum Value 0

Data Source Type Gauge

OID – (value you found above) .1.3.6.1.4.1.41112.1.4.7.1.3.1.36.90.76.236.135.45

Create